DTC U3003:16 [TELEMATICS COMMUNICATION UNIT (TYPE-B)]
id1602a7009500
Outline
System malfunction location |
Telematics communication unit power supply voltage low input |
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Detection condition
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• The telematics communication unit power supply circuit voltage is lower than the standard for 10 s or more.
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Fail-safe
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After this DTC is detected, collision is detected within 5 s
• Switches the power supply to the internal battery and continues the telematics communication unit operation.
After this DTC is detected, collision is not detected within 5 s
• Turns the telematics communication unit power supply off.
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Possible cause
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• DTCs are stored in the PCM.
• Battery malfunction
• Malfunction in generator
• Telematics communication unit connector or terminal malfunction
• Short to ground or open circuit in telematics communication unit power supply circuit
• Telematics communication unit malfunction
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Diagnostic Procedure
Step |
Inspection |
Results |
Action |
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1
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VERIFY TELEMATICS COMMUNICATION UNIT DTCs AGAIN
• Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)
• Perform the DTC inspection for the telematics communication unit.
(Refer to the [DTC INSPECTION] in the workshop manual)
• Is the same Pending DTC present?
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Yes
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Go to the next step.
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No
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Go to repair completion verification 2.
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2
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INSPECT PCM FOR MALFUNCTION
• Perform the DTC inspection for the PCM.
(Refer to the [DTC INSPECTION] in the workshop manual)
• Is a DTC displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [PCM (SKYACTIV-G)]] in the workshop manual)
(Refer to the [DTC TABLE [PCM (SKYACTIV-D)]] in the workshop manual)
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No
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Go to the next step.
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3
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INSPECT BATTERY FOR MALFUNCTION
• Inspect the applicable part.
(Refer to the [BATTERY INSPECTION] in the workshop manual)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
(Refer to the [BATTERY RECHARGING] in the workshop manual)
(Refer to the [BATTERY REMOVAL/INSTALLATION] in the workshop manual)
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4
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INSPECT GENERATOR FOR MALFUNCTION
• Inspect the applicable part.
(Refer to the [GENERATOR INSPECTION] in the workshop manual)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
(Refer to the [GENERATOR REMOVAL/INSTALLATION] in the workshop manual)
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5
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INSPECT TELEMATICS COMMUNICATION UNIT CONNECTOR FOR MALFUNCTION
• Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)
• Are the connector and terminal normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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6
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INSPECT TELEMATICS COMMUNICATION UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
• Inspect the applicable circuit for a short to ground and open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)
• Switch the ignition ON (engine off or on) and wait for 10 s or more.
• Perform the DTC inspection for the telematics communication unit.
(Refer to the [DTC INSPECTION] in the workshop manual)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the telematics communication unit, then go to the next step.
(Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)
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No
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Go to the next step.
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Repair completion verification 2
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VERIFY IF OTHER DTC IS DISPLAYED
• Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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